Improvement in devices for preventing retrograde motion in sewing-machines



LEWIS & BAIRD.

Preventative of Retrograde Motion in Sewing Machines.

Eatented July 14, 1863.

ranying'. drawings, figures, and letters of ref- UNITED STATES PATENT OFFICE.

F. LEWIS, OF WATERTOWN, AND JOSEPH H. BAlRD, OF WATERBURY, CONNECTICUT. Y I

IMPROVEMENT IN DEVlCES FOR PREVENTING RETROGRADE MOTION IN SEWING-MACHINES.

Specification forming part of Letters Patent 39,236. dated July 14, 1863.

9 To all whom it may concern Be it known that we, WILLIAM F. LEWIS, of VVatertowu, in the count-yot' Litehtield, and JOSEPH H. BAIRD, ofVVaterhuryfin the county of New Haven,and State of Connecticut, have invented a new and Improved Automatic Stop to Prevent Retrograde Motion in Sewing- Machines; and we do hereby declare the following to be a full, clear, and exact description thereof, reference being had to the accomerence, making part of this specification.

Ofthe said drawings, Figure 1 is a top view, and Fig. 2 an end elevation.

Similar letters of referenceindicatelike parts in both drawings.

In machines using a rotating hook, like the A. B. Wilson machine, much trouble is experienced, particularly when learning to use the machine, from the retrograde motion of the book, which breaks the thread, causing it frequently to snarl and break tl e needle.

The object of our invention is to prevent this difficulty; and it consists in the employment, in combination with a rotating hook,ofa ratchet-wheel and friction-pmvl.

To enable others skilled in the art to make and use our invention, we will describe the construction and operation thereof.

A A represent standards secured to a base, B, in which standards is a cranked shaft, 3. provided with a pulley, 1, and beltt'or driving the hook-pulley 2. The rotating hook to has its bearings in'the standard, and has a spindle. D, for filling the under spool with thread. On this spindle or 'the end of the hook, iflong enough, we secure a small ratchet-wheel, E.

To the standard A we secure a pin, Gr, upon which the lever F, provided with a pawl, d, has its fulcrum. The parts I) b of the lever F consist of thin metal plates embracing the ratchet-wheel on both sides, which readily yield, and they may be provided with a friction surface, 0,-of leather or similar material, and the friction of the same on the sides of the ratchet-wheel E is regulated by means ot' the screw H.

The operation will be as follows: The hook being driven in the proper direction, the friction of the parts lib of the lever F on the sides of the ratchet-wheel E will lift the lever Thecotnbinatiomwith a rotating hooked Q mandrel, C, for carrying the thread around a bobbin, ot' a ratchet-wheel, E, and frictionlever F, provided with a pawl, 01, constructed, arranged, and operating substantially as described, and for the purposes set forth.

WM. F. LEWIS. JOS. H. BAIRD. Witnesses: 1

JOHN W. PENEL, HORACE B. PnoK. 

